11-26-2013 03:27 PM
How can I use proc power to calculate the sample size needed for the following
2 independent groups 1:2 randomization
2-sided 95% confidence interval lower bound of the mean difference must exceed +2,SD=3.1
How can I specify the lower bound in the SAS code?
11-27-2013 08:34 AM
thank you, Jack2012, but there is no ratio in my example. I specifically need an example with a confidence interval around a mean difference.